17 ENGINE
If the shift drum is not seated correctly:
- Change the shift drum and/or the bearing.
- Check bearing (D for stiffness and wear.
If the bearing is stiff or worn:
- Change the bearings.
- Check shift rollers
C,
for surface damage and cracking.
If the shift roller exhibits surface damage or cracking:
- Change the shift roller.
- Check springs
0
of the shift rails for damage and wear.
If the spring is broken or worn:
- Change the spring of the shift rail.
- Check shift rails
0)
on a flat surface for run-out.
If there is run-out:
- Change the shift rail.
- Check the shift rails for scoring, seizure marks, and stiffness in the shift fork.
If the shift rail has scoring, seizure marks, or does not move easily in the shift fork:
- Change the shift rail.
- Check sliding plate @ in contact areas
(9
for wear.
If the sliding plate is worn:
- Change the sliding plate.
- Check return surface Ci) on the sliding plate for wear.
If deep notches are present:
- Change the sliding plate.
- Check guide pin @ for looseness and wear.
If the guide pin is loose and/or worn:
- Change the sliding plate.
- Preassemble the shift shaft.(� p. 212)
304682-10
17.4.38 Preassembling the shift shaft
304683-10
212
- Check clearance
O
between the sliding plate and the shift
quadrant.
Shift shaft - play in sliding
plate/shift quadrant
0.40 ... 0.80 mm (0.0157 ...
0.0315 in)
If the measured value does not meet specifications:
- Change the sliding plate.
- Secure the short end of the shift shaft in the bench vise.
Guideline
I Use soft jaws.
- Mount sliding plate
O
with the guide pin facing downward
and put the guide pin on the shift quadrant.
- Mount pressure spring
@.
- Slide on spring guide (D, push return spring
C,,
with the
offset end facing upward, over the spring guide and lift the
offset end over abutment bolt
0.
..
